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Any mechanical device converts force applied to get a desired output. suppose a load needs to be moved u apply a force, there is a particular point in the whole setup called 'fulcrum' which acts as point where transfer of the action takes place. In a lever look for where these 3 things appear :fulcrum load force.
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It has been found by experiment that two equal forces acting in opposite directions that is clock wise and anti clock wise and applied to a uniform lever at equal distances from the fulcrum counteract each other and establish state of equilibrium , or balance , in the lever

 

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As it is an entire chapter, it is difficult to explain the principle here. You may refer to the site: Teach Engineering.

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